Fratina, S;
Abe, K;
Abe, K;
Adachi, I;
Aihara, H;
Anipko, D;
Arinstein, K;
... Belle Collaboration; + view all
(2007)
Evidence for CP violation in B-0 -> D+D- decays.
PHYS REV LETT
, 98
(22)
, Article 221802. 10.1103/PhysRevLett.98.221802.
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Abstract
We report measurements of the branching fraction and CP violation parameters in B-0 -> D+D- decays. The results are based on a data sample that contains 535x10(6) B(B) over bar pairs collected at the Upsilon(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We obtain [1.97 +/- 0.20(stat)+/- 0.20(syst)]x10(-4) for the branching fraction of B-0 -> D+D-. The measured values of the CP violation parameters are S=-1.13 +/- 0.37 +/- 0.09, A=0.91 +/- 0.23 +/- 0.06, where the first error is statistical and the second is systematic. We find evidence of CP violation in B-0 -> D+D- at the 4.1 sigma confidence level. While the value of S is consistent with expectations from other measurements, the value of the parameter A favors large direct CP violation at the 3.2 sigma confidence level, in contradiction to standard model expectations.
| Type: | Article |
|---|---|
| Title: | Evidence for CP violation in B-0 -> D+D- decays |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.98.221802 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.98.221802 |
| Language: | English |
| Additional information: | © 2007 The American Physical Society |
| Keywords: | B DECAYS, BELLE, ASYMMETRIES, DETECTOR, PHYSICS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1308552 |
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